SEAT BELT WARNING SYSTEM(w/ Occupant Classification System) Rear Seat Belt Warning Light Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either rear door is open or closed based on the condition of the left and right rear door courtesy light switch assemblies and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects the rear seat belt state. The rear seat belt warning lights on the radio receiver assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

B005MY5E08
B005PTFE02

CAUTION / NOTICE / HINT

Note


  • The seat belt warning system (w/ Occupant Classification System) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Door Courtesy SW Rear door courtesy light switch assembly (for RH) ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -
      RL Door Courtesy SW Rear door courtesy light switch assembly (for LH) ON or OFF

      ON: Rear door LH open

      OFF: Rear door LH closed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      RR Door Courtesy SW
      RL Door Courtesy SW
      OK
      The GTS display changes correctly in response to the rear door condition.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK REAR SEAT BELT WARNING


    1. B005OWLC01
      *1 Rear Seat Belt Warning Light (Radio Receiver Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      Result
      Result Proceed to
      The rear seat belt warning lights (all seats) operate normally A
      The rear seat belt warning lights (all seats) do not operate normally B
      The rear seat belt warning light (RH) does not operate normally C
      The rear seat belt warning light (center) does not operate normally D
      The rear seat belt warning light (LH) does not operate normally E

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    READ VALUE USING GTS Click here

    D

    READ VALUE USING GTS Click here

    E

    READ VALUE USING GTS Click here

    B

  3. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the J50 radio receiver assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      J50-15 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      J50-15 (IG) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Reconnect the J50 radio receiver assembly connector.

    2. Disconnect the J10 combination meter assembly connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      J10-35 (RLMT) - Body ground Engine switch on (IG) 11 to 14 V
      J10-36 (RCMT) - Body ground Engine switch on (IG) 11 to 14 V
      J10-37 (RRMT) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE RADIO RECEIVER ASSEMBLY


    1. Temporarily replace the radio receiver assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK REAR SEAT BELT WARNING


    1. B005OWLC01
      *1 Rear Seat Belt Warning Light (Radio Receiver Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning lights (all seats) operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  7. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (R) Rear RH seat belt buckle switch signal ON or OFF

      OFF: Rear RH seat belt fastened

      ON: Rear RH seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (R)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY) Click here

    A

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH - BODY GROUND)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the R19 rear seat 3 point type belt assembly RH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-12 (RRSB) - R19-1 (RBR+) Always Below 1 Ω
      J10-12 (RRSB) or R19-1 (RBR+) - Body ground Always 10 kΩ or higher
      R19-2 (RBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the J140 radio receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-37 (RRMT) - J140-3 (RRID) Always Below 1 Ω
      J10-37 (RRMT) or J140-3 (RRID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE RADIO RECEIVER ASSEMBLY


    1. Temporarily replace the radio receiver assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK REAR SEAT BELT WARNING


    1. B005OWLC01
      *1 Rear Seat Belt Warning Light (Radio Receiver Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning light (RH) operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  12. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (C) Rear center seat belt buckle switch signal ON or OFF

      OFF: Rear center seat belt fastened

      ON: Rear center seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (C)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY) Click here

    A

  13. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the S20 rear seat inner belt assembly LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-13 (RCSB) - S20-1 (CBR+) Always Below 1 Ω
      J10-13 (RCSB) or S20-1 (CBR+) - Body ground Always 10 kΩ or higher
      S20-2 (CBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT REAR SEAT BELT ASSEMBLY INNER LH


    1. Remove the rear seat inner belt assembly LH.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      S20-1 - B-2 Always Below 1 Ω
      S20-2 - B-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR CENTER SEAT INNER BELT ASSEMBLY Click here

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY LH Click here

  15. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the J140 radio receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-36 (RCMT) - J140-4 (RCID) Always Below 1 Ω
      J10-36 (RCMT) or J140-4 (RCID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. REPLACE RADIO RECEIVER ASSEMBLY


    1. Temporarily replace the radio receiver assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK REAR SEAT BELT WARNING


    1. B005OWLC01
      *1 Rear Seat Belt Warning Light (Radio Receiver Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning light (center) operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  18. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (L) Rear LH seat belt buckle switch signal ON or OFF

      OFF: Rear LH seat belt fastened

      ON: Rear LH seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (L)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY) Click here

    A

  19. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the S20 rear seat inner belt assembly LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-14 (RLSB) - S20-3 (LBR+) Always Below 1 Ω
      J10-14 (RLSB) or S20-3 (LBR+) - Body ground Always 10 kΩ or higher
      S20-4 (LBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the J10 combination meter assembly connector.

    2. Disconnect the J140 radio receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J10-35 (RLMT) - J140-5 (RLID) Always Below 1 Ω
      J10-35 (RLMT) or J140-5 (RLID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. REPLACE RADIO RECEIVER ASSEMBLY


    1. Temporarily replace the radio receiver assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  22. CHECK REAR SEAT BELT WARNING


    1. B005OWLC01
      *1 Rear Seat Belt Warning Light (Radio Receiver Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning light (LH) operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here